1.   As a result, a quantum bit in some sense contains more information than its classical counterpart.

2.   Because of this peculiarity, the bits in a quantum computer are called quantum bits, or qubits, for short.

3.   More importantly, as the number of quantum bits grows, the amount of information required to describe it grows exponentially.

4.   States stored in memory will get jostled inadvertently, for example, and operations will be applied to the wrong quantum bit.

5.   That mixed state could form the base of a computer built around not binary bits but the quantum bit, or qubit.